Introduce btr_node_status() and add btr support to the file writer.
[paraslash.git] / file_write.c
1 /*
2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file file_write.c simple output plugin for testing purposes */
8
9 #include <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12 #include <sys/time.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "buffer_tree.h"
20 #include "write.h"
21 #include "write_common.h"
22 #include "string.h"
23 #include "fd.h"
24 #include "file_write.cmdline.h"
25 #include "error.h"
26
27 /** data specific to the file writer */
28 struct private_file_write_data {
29 /** the file descriptor of the output file */
30 int fd;
31 /** non-zero if \a fd was added to the write fd set */
32 int check_fd;
33 };
34
35 /*
36 * Get a random filename.
37 *
38 * This is by no means a secure way to create temporary files in a hostile
39 * directory like \p /tmp. However, we use it only for creating temp files in
40 * ~/.paraslash, for which it is OK. Result must be freed by the caller.
41 */
42 __must_check __malloc static char *random_filename(void)
43 {
44 char *result, *home = para_homedir();
45 struct timeval tv;
46
47 gettimeofday(&tv, NULL);
48 srandom(tv.tv_usec);
49 result = make_message("%s/.paraslash/%08lu", home,
50 para_random(99999999));
51 free(home);
52 return result;
53 }
54
55 static int file_write_open(struct writer_node *wn)
56 {
57 struct private_file_write_data *pfwd = para_calloc(
58 sizeof(struct private_file_write_data));
59 struct file_write_args_info *conf = wn->conf;
60 char *filename;
61
62 if (conf->filename_given)
63 filename = conf->filename_arg;
64 else
65 filename = random_filename();
66 wn->private_data = pfwd;
67 pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
68 if (!conf->filename_given)
69 free(filename);
70 if (pfwd->fd >= 0)
71 return 1;
72 free(pfwd);
73 return -E_FW_OPEN;
74 }
75
76 static int file_write_pre_select(struct sched *s, struct writer_node *wn)
77 {
78 struct private_file_write_data *pfwd = wn->private_data;
79 struct writer_node_group *wng = wn->wng;
80
81 pfwd->check_fd = 0;
82 if (pfwd->fd <= 0)
83 return -E_FW_NO_FILE;
84 if (!*wng->loaded)
85 return 1;
86 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
87 pfwd->check_fd = 1;
88 return 1;
89 }
90
91 static void file_write_pre_select_btr(struct sched *s, struct task *t)
92 {
93 struct writer_node *wn = container_of(t, struct writer_node, task);
94 struct private_file_write_data *pfwd = wn->private_data;
95 int ret;
96
97 t->error = 0;
98 pfwd->check_fd = 0;
99 ret = btr_node_status(wn->btrn, wn->min_iqs);
100 if (ret >= 0) {
101 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
102 pfwd->check_fd = 1;
103 }
104 if (ret != 0) {
105 s->timeout.tv_sec = 0;
106 s->timeout.tv_usec = 1;
107 }
108 }
109
110 static int file_write_post_select(struct sched *s, struct writer_node *wn)
111 {
112 struct private_file_write_data *pfwd = wn->private_data;
113 struct writer_node_group *wng = wn->wng;
114 int ret;
115
116 if (!pfwd->check_fd)
117 return 1;
118 if (*wng->loaded <= wn->written)
119 return 1;
120 if (!FD_ISSET(pfwd->fd, &s->wfds))
121 return 1;
122 // PARA_INFO_LOG("writing %zd\n", *wng->loaded);
123 ret = write(pfwd->fd, *wng->bufp + wn->written,
124 *wng->loaded - wn->written);
125 if (ret < 0)
126 return -E_FW_WRITE;
127 wn->written += ret;
128 return 1;
129 }
130
131 static void file_write_close(struct writer_node *wn)
132 {
133 struct private_file_write_data *pfwd = wn->private_data;
134
135 close(pfwd->fd);
136 file_cmdline_parser_free(wn->conf);
137 free(pfwd);
138 }
139
140 static void file_write_post_select_btr(__a_unused struct sched *s,
141 struct task *t)
142 {
143 struct writer_node *wn = container_of(t, struct writer_node, task);
144 struct private_file_write_data *pfwd = wn->private_data;
145 struct btr_node *btrn = wn->btrn;
146 int ret;
147 char *buf;
148 size_t bytes;
149
150 t->error = 0;
151 ret = btr_node_status(btrn, wn->min_iqs);
152 if (ret == 0)
153 return;
154 if (ret < 0)
155 goto err;
156 if (!pfwd->check_fd)
157 return;
158 if (!FD_ISSET(pfwd->fd, &s->wfds))
159 return;
160 bytes = btr_next_buffer(btrn, &buf);
161 assert(bytes > 0);
162 //PARA_INFO_LOG("writing %zu\n", bytes);
163 ret = write(pfwd->fd, buf, bytes);
164 if (ret < 0)
165 goto err;
166 btr_consume(btrn, ret);
167 return;
168 err:
169 assert(ret < 0);
170 t->error = ret;
171 }
172
173 __malloc static void *file_write_parse_config(const char *options)
174 {
175 struct file_write_args_info *conf
176 = para_calloc(sizeof(struct file_write_args_info));
177 int ret = file_cmdline_parser_string(options, conf, "file_write");
178
179 PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
180 if (!ret)
181 return conf;
182 free(conf);
183 return NULL;
184 }
185
186 /** the init function of the file writer */
187 void file_write_init(struct writer *w)
188 {
189 struct file_write_args_info dummy;
190
191 file_cmdline_parser_init(&dummy);
192 w->open = file_write_open;
193 w->pre_select = file_write_pre_select;
194 w->pre_select_btr = file_write_pre_select_btr;
195 w->post_select = file_write_post_select;
196 w->post_select_btr = file_write_post_select_btr;
197 w->parse_config = file_write_parse_config;
198 w->close = file_write_close;
199 w->shutdown = NULL; /* nothing to do */
200 w->help = (struct ggo_help) {
201 .short_help = file_write_args_info_help,
202 .detailed_help = file_write_args_info_detailed_help
203 };
204 file_cmdline_parser_free(&dummy);
205 }